Receptor Mechanism

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Author:
patrickedore
ID:
221745
Filename:
Receptor Mechanism
Updated:
2013-05-30 22:36:31
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  1. LIGAND-GATED ION CHANNEL MECHANISM
    • Structure: Multiple subunits forming pore
    • Location: Neurone

    • 1. Valium bind to GABA receptor
    • 2. Shape change- pore open
    • 3. Cl- ions enter neuron- HYPERPOLARISATION
    • 4. Low ActionPotential chance

    • 1. Nicotinic Ach- Synapse
    • 2. Na+ ions enter
    • 3. DEPOLARISATION
  2. General Tyrosine KINASE
    • Location: Plasma membrane
    • Structure: N-terminus- Ligand Binding
    • C-terminus inside cell= Protein Kinase activity

    • 1. Insulin/Growth Factor bind to receptor
    • 2. Receptor dimerisation
    • 3. Receptor autophosphorylation each other
    • 4. Target protein use SH2 part to bind/activate
    • 5. Biological response
    • 6. Enzyme dephosphorylate- T.K OFF
  3. TYROSINE KINASE LEUKEMIA -DRUG MECHANISM
    GLEEVEC

    • 1. Leukemia - W.Blood cell cancer- ¬†overactive T.K
    • 2. Gleevec bind ATP binding site of Tyrosine Kinase
    • 3. No ATP Binding
    • 4. No Autophosphorylation¬†
    • 5. No target proteing with SH2 bind
    • 6. No Biological response
  4. TYROSINE KINASE BREAST CANCER/ANTIBODY HERCEPTIN
    • HERCEPTIN= ANTIBODY
    • 1. HER2 GENE- HIGH HER2 PROTEIN is Tyrosine K.
    • overexpression = HIGH cell division/cancer
    • 2. Herceptin bind HER2 Receptor on cell
    • 3. No Autophosp/signalling
    • ALSO- Stimulate immune response kill cells with Herceptin bound.

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